Roast rice over medium heat until golden. Cool and process in a food processor or a blender and sift. Can be stored in an air tight container for up to 3 months.
You can also purchase this premade at most asian grocery stores. However, sometimes the stores don’t sell enough to “refresh” their supplies in time, thus you might end up buying… you know. If kept to long the smell will turn from a nutty fragrance (fresh) to a oily odor (too old to use).